- Any solid concretion, formed in any part of the body, but
most frequent in the organs that act as reservoirs, and in the passages
connected with them; as, biliary calculi; urinary calculi, etc. - A method of computation; any process of reasoning by the
use of symbols; any branch of mathematics that may involve calculation.
Meaning of 'calculus' (Princeton's WordNet)
1 . calculus
[ n]
Meaning (1): - a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body